Juncus L.

Leaf sheaths open; seeds numerous Juncus

Leaves flat and channelled, or if terete then less than 1 mm wide and not septate

Each flower with a prophyll (bracteole) beneath it. Leaves with or without auricles

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Leaf sheaths tapering above. Flowers solitary on an elongated rachis or cymose or clustered in the leaf axils. Perianth segments lanceolate, acute, 3–4 mm long, as long as the capsule. Leaves up to 10 cm long, but often less than 5 cm. Annual. Widespread. Damp places. Toad Rush Juncus bufonius

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Leaf sheaths auriculate or truncate